MODEL YB8 PROGRAMMING SECTION
April 1999/Manning Environmental Inc.
3DJH%
Constant current sources are not common. However, batteries of known voltages are readily available; thus,
using a voltage source to calibrate the sampler is useful.
A 4-20 mA source can be calibrated by placing a 250 ohm resistor in the loop and measuring the voltage drop
across the resistor with a voltmeter. Table A1 can be used to interpolate the corresponding MA signal or
Ohms law (V/R = 1) can be used to calculate the mA signal. If the voltage is 4.25, then the mA signal is
4.25/250 = .017 amps or 17 mA.
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